Mechanical riveting machine



April 3, 1934.

A. NORIN MECHANICAL RIVETING MACHINE Filed Aug. 27, 1931 3 Sheets-Sheet 1 I N VEN TOR EH. 77077.71 BY w A TTORNE Y.

April 3, 1934. A. A. NORIN MECHANICAL RIVETING MACHINE Filed Aug. 27, 1931 3 Sheets-Sheet 2 INVENTOR. HHZJZWL BY ATTORNEY.

April 3, 1934. A. A. NORIN MECHANICAL RIVETING MACHINE 5 Sheets-Sheet 5 Filed Aug. 27, 1931 \w MN 3 INVENTOR. 17/7. 770 zvz7 TORNEY.

k E am A Patented Apr. 3, 1934 UNITED STATES PATENT OFFICE MECHANICAL RIVETING MACHINE Allan A. Norin, Chicago, Ill., assignor to Norin Engineering 00., Chicago, Ill.

Application August 27,

3 Claims.

5 pneumatic or other fluid operated riveting machines, but these machines, while meeting with success and. being adopted as standard equipment in a number of factories and machine shops have certain inherent disadvantages which have not been fully overcome.

Some of these disadvantages are the necessity of providing a compressor and prime mover therefor and a tank for storing the compressed air for actuating the riveting machine. This not only adds to the initial installation cost, but the compressor, engine, and the storage tank occupy valuable space and require the attention, time to time, of an attendant.

It is, therefore, one of the primary objects of my invention to provide a riveting machine in which all operating parts are mounted directly on the machine and form a positive part thereof and in which the riveting plunger is actuated through a novel intermediate mechanism from a motor mounted on the frame of the machine.

Another salient object of my invention is to provide a mechanical riveting machine having a novel slip clutch interposed between the driving motor and the riveting plunger, so that the slip clutch will release at a predetermined pressure, so as to insure the proper force being delivered to the riveting plunger at all times.

A further important object of my invention is the provision of a novel reverse clutch mechanism, whereby the direction of movement of the plunger will be reversed when the same reaches the extreme ends of its movement, the movable section of the reverse clutch being automatically actuated to a neutral position when the plunger has reached the limit of its movement in either direction.

A further object of my invention is the provision of novel means for mounting the release clutch mechanism and the reverse drive mechanism within a single housing or casing, whereby a compact arrangement of parts will be had and whereby ease and positive operation is insured.

A further object of my invention is the provision of a novel drive mechanism interposed 0 between the riveting plunger and the operating sector gear, so that the maximum amount of pressure will be delivered to the plunger head at the completion of a riveting stroke, the maximum amount of pressure being continued duringthe completion of the riveting operation.

1931, Serial No. 559,724

A still further object of my invention is to provide a mechanical riveting machine of the above character, which will be durable and cilicient in use, one that will be simple and easy to manufacture and one which can be placed upon the market at a. reasonable cost.

With these and other objects in view, the invention consists in the novel construction, arrangement, and formation of parts as will be hereinafter more specifically described, claimed, and illustrated in the accompanying drawings, in which drawings:

Figure 1 is a fragmentary side elevation of my improved mechanical riveting machine, with parts thereof broken away and in section to illustrate certain novel operating parts of my machine;

Figure 2 is a fragmentary front elevation of my improved machine;

Figure 3 is a detail transverse section through the head of the riveting machine taken on the line 3-3 of Figure 1, looking in the direction of the arrows;

Figure 4 is a detailed sectional view taken on the line 4--4 of Figure 3 looking in the direction of the arrows, illustrating the release cam for the movable section of the reverse or return clutch;

Figure 5 is a'detailed section taken at right angles to Figure 4, illustrating the release cam;

Figure 6 is a longitudinal section through the head of the riveting machine, taken on the line 6-6 of Figure 3.

Referring to thedrawings in detail, wherein similar reference characters designate corresponding parts throughout the several views, the letter A generally indicates my improved riveting machine which comprises a supporting frame or standard 10 having formed on its forward end, the bearing guide 11 for the riveting plunger 12. The extreme upper end of the riveting plunger 12 has secured thereto, a track or wedge 13.

It is to be noted that the upper active face of the track or wedge 13 is of an arcuate shape and that the maximum curvature of the active face is at the forward end of the track or wedge. This provides a maximum amount of movement of the riveting plunger at the initial start of operation of the riveting plunger.

Due to the curvature at the rear end of the track or wedge, a maximum amount of pressure is reached approximately at the end of the working stroke and this pressure is maintained during the completion of the stroke.

Arranged upon the standard 10 are upstanding spaced supporting side plates 14 and 15. One of these plates has bolted or otherwise secured thereto, the casing or housing 16 for the intermediate drive of the riveting plunger 12. A lateral extending bracket 17 is bolted or otherwise secured to the housing 16 and supports the driving motor 18. As shown, the drive motor 18 is of the rotary electric type and the same is of any desired horse power.

Rotatably mounted within the side plates 14 and is the main operating shaft 19 and this shaft extends into the housing or casing 16. Arranged at right angles to the operating shaft 19 is the main drive shaft 20 which is connected by means of a suitable coupling 21 with the armature shaft 22 of the electric drive motor 18. It is to be noted that suitable bearings 23 are provided for the drive shaft 20 and that this shaft has keyed or otherwise secured thereto, the worm 24. I also preferably provide a fiy wheel 25 for storing up energy from the operating motor 18.

The worm 24 meshes with a worm gear 26 which is of an annular configuration, and this worm gear has secured thereto, a hub plate 27 carrying an inwardly directed hub 23 rotatably mounted on the main or operating shaft 19. The hub plate 27 adjacent to the inner face of the worm gear 26 carries at spaced points anti-friction rollers 29 which form a part of the release clutch mechanism as will now be described.

Mounted on the hub 28 for free rotation, is the clutch body 30 which carries the radially disposed release pins 31. The release pins 31 are normally urged toward the rollers 29 by means of expansion coil springs 32 and outward movement of the pins 31 are limited by means of a retaining ring 33 carried by the clutch body 30, it being noted that the release pins 31 are provided with stop shoulders for cooperation with the said ring 33.

The outer ends of the release pins31 are of a novel construction for acting in conjunction with the rollers 29, and it is to be noted that the outer ends of the pins are tapered to provide oppositely inclined release faces 34 and 35, for a purpose, which will be hereinafter more fully described and pointed out.

Secured to the inner face of the worm gear 26, for unitary movement therewith, is an internal ring gear 36. This ring gear 36 is located on the opposite side of the worm gear 26 from a hub plate 27, as is clearly shown in Figure 3 of the drawings. Meshing with the internal ring gear 36 is a plurality of rotatable pinions 37. These pinions 37 are rotatably mounted on bearing pins 38 carried by one side wall of the housing or casing 16.

The pinions 37 mesh with a gear 39 and rotate the said gear 39 in a reverse direction from the worm gear 26 and the clutch body 30. The internal ring gear 36, the pinions 3'7 and the gear 39, form a gear drive arrangement, for a purpose, which will also be hereinafter more fully described.

The facing portions of the rotatable gear 39 and the clutch body 30 are provided with clutch teeth 40 and 41 respectively, and these clutch teeth 40 and 41 form a part of a drive and return clutch mechanism. This drive and return clutch mechanism embodies a clutch hub section 42, feathered or splined on the main shaft 19 and the inner end of the clutch hub 42 is provided with teeth 43 for engagement either with the clutch teeth 40 or the clutch teeth 41. It is obvious from the description so far, that when the clutch teeth 43 of the clutch hub 42 arein engagement with the teeth 41 that the shaft 19 will be rotated in one direction, say in an anti-clockwise direction (referring to Figure 1 of the drawings) for imparting downward movement to the riveting plunger, and when the teeth 43 are in engagement with the teeth 40, the shaft 19 will be driven in a reverse or clockwise direction for lifting the riveting plunger.

The teeth 41 of the clutch release body 30 are of a novel shape and it is to be noted by referring to Figure 3 of the drawings, that these teeth 41 are provided on one side with under cut, abrupt faces 44, and on the other side with inclined release faces 45.

Projecting outwardly from one face of the clutch hub 42 are a plurality of spring-pressed pins 46 and these pins 46 bear against a wearring 47 which engages the hub 28 of the clutch body 27. These spring-pressed pins 46 normally urge the clutch hub 42 to the left, referring to Figure 3 of the drawings and the teeth 43 toward the teeth 40.

Manual means is provided for actuating the clutch hub and this means may comprise a spanner 48 for rotatably engaging the clutch hub. This spanner 48 is carried by the upper end of an operating lever 49 and the lever is rockably mounted intermediate its ends on a suitable pivot pin 50 carried by the housing or casing 16. The lower end of the lever 49 has pivotally connected thereto, a link 51 which leads to a suitable foot treadle (not shown) arranged adjacent to the base of the riveting machine. Thus, upon downward movement of the link 51, the lever 49 will be rocked upon its pivot for moving the clutch hub 42 against the tension of its spring-pressed pins 46 for urging the clutch teeth 43 into engagement with the clutch teeth 41.

This will bring about a direct drive between the drive shaft 20 and the main shaft 19 iuitil the clutch hub is automatically released, as will be later brought out.

When the teeth 43 of the clutch hub are moved into engagement with the teeth 40 of the gear 39 by means of the spring-pressed pins 46, the shaft 19 will be driven in a reverse direction and this movement will continue until the clutch hub is released.

This release mechanism comprises an inclined cam track section 52 rigidly secured to the inner face of the supporting plate 15 and a cam pin 53 carried by the outer face of the clutch hub 42. It is thus obvious, that when the pin 53 rides on the cam track 52, that the clutch hub 42 will be moved to the right, referring to Figure 3 of the drawings, against the tension of the pins 46, which will disconnect the teeth 43 from the teeth 40.

Keyed or otherwise secured on the main shaft 19 is a drive pinion 55 and as shown, this pinion being confined between the supporting plates 14 and 15 and meshing at all times with the sector gear 56. This sector gear 56 is rotatably mounted upon a supporting shaft 57 carried by the plates 14 and 15 and carries the radially extending crank arms 58. The outer ends of the crank arms 58 carry the roller 59 which operates against the arcuate active face of the cam track or wedge 1.3 for imparting the desired downward movement to the riveting plunger 12. Links 60 are employed for connecting the crank arms 58 with the plunger, so as to insure the return of the plunger to its raised position after the completion of the working stroke and upon reverse movement of the shaft 19. As shown, I have provided a pin and slot comiection between the links 60 and the crank arms 58, so as to allow proper swinging movement of the crank arms. 58 relative to the plunger.

In operation of my improved device, the circuit is closed to the motor 18 in any preferred manner and the operator of the machine actuates the clutch hub 42 by downward pressure on the treadle which moves the teeth 43 thereof into: engagement with the teeth 41 of the release clutch body 30. This brings about the direct drive of the shaft 19 from the shaft 20 through the medium of the release clutch embodying the release pins and the rollers 29. The rotation of the main shaft 19 in an anti-clockwise direction will operate the crank arm 58 through the medium of a pinion 55 and sector gear 56, forcing down the riveting plunger into engagement with the work. This movement continues until the riveting dies on the plunger and frame (not shown) stop against each other or on the work or until the Wedge 13 stops against the frame 10. At this instant, the pressure will overcome the tension of the springs 32 and the pins 31 will be forced inwardly on the rollers 29 and the clutch body30 will cease revolving. The angularity of slopes 35 on pins 31 and the springs allow the clutch body 30 to give at a predetermined load. As the pins 31 pass over rollers 29, the springs 32 push against the rollers 29 and revolve the clutch body 30 in an opposite direction. This brings the inclined portions 45 of the clutch teeth 41 against the inclined faces of the clutch teeth 43 of the hub 42 and slides the hub to the left, releasing the clutch body 30 from the clutch hub 42. The spring-pressed pins 46 will then automatically move the clutch hub 42 to the left and bring about the engagement of the teeth 43 with the teeth'40 of the gear 39, which is normal position of the clutch hub. The foot of the operator is initially held on the treadle with just sufiicient pressure to hold the teeth 43 and 41 in engagement. The'operator can feel when the clutch hub 42 tends to shift, at which time the operator removes his foot from the treadle.

This will rotate the main shaft 19 in a reverse direction and cause the lifting of the riveting plunger 12. This is accomplished due to the drive being through the worm gear 26, the idler pinions 37, the gear 39, the clutch hub 42 and shaft 19. This completes one complete cycle of operation and when it is desired to again operate the machine, the operator again depresses the foot treadle.

From the foregoing description, it can be seen that I have provided an exceptionally simple and durable type of self-contained mechanical riveter, in which the proper operation of the riveting plunger is insure'dboth on its down and up stroke.

Changes in details may be made without departing from the spirit or the scope of the invention, but what I claim as new is:

1. In a machine of the class described, a main shaft, a motor, a drive shaft, means operatively connecting the drive shaft with the motor for driving said shaft continuously in one direction, a gear rotatably mounted on the main shaft actuated from the drive shaft including a hub and hub plate receiving said main shaft, a clutch body rotatably mounted on the hub and confined within said gear, a plurality of equally distantly spaced rollers carried by the inner face of the gear, a plurality of equally distantly spaced springpressed release pins carried by the clutch body for engaging the rollers, a clutch hub slidable on the main shaft and rotatable therewith having clutch teeth, mating clutch teeth on the clutch body having inclined faces, the release pins having their outer ends oppositely inclined for engaging the rollers whereby upon release of said release pins the inclined faces of the spring-pressed release pins bearing against the rollers will rotate the clutch body in a reverse direction for bringing the inclined faces of the clutch teeth of the clutch body into engagement with the teeth of the clutch hub for releasing the same.

2. In a machine of the class described, a main frame, a main shaft rotatable on the main frame, a drive motor on the main frame, a drive shaft rotatably mounted on the frame and driven continuously in one direction from the drive motor, a worm on said drive shaft, a worm gear meshing With the worm including a hub rotatably mounted on the main shaft and a hub plate, a release clutch body rotatably mounted on the hub and confined within the worm gear, means establishing driving connection between the release clutch body and the worm gear, an internal ring gear secured to the worm gear, a driven gear, a plurality of idler pinions carried by the frame and meshing with the internal ring gear and the driven gear and rotatable independently of the main shaft, facing clutch teeth carried by the driven gear and the release clutch body, and a clutch hub slidable on the main shaft and rotatable therewith having clutch teeth for engaging either the clutch teeth carried by the driven gear or the clutch teeth carried by the release clutch body.

3. In a machine of the class described, a main shaft, a drive motor, a drive shaft rotatably mounted on the frame and driven continuously in one direction from the drive motor, a worm on said drive shaft, a worm gear meshing with the worm including a hub rotatably mounted on the main shaft and a hub plate, a release clutch body rotatably mounted on the hub and confined within the worm gear, means establishing driving connection between the release clutch body andthe worm gear, an internal ring gear secured to the worm gear, a plurality of idler pinions carried by the frame and meshing with the internal ring gear, a driven gear meshing with the idler pinions and rotatable independently of the main shaft, facing clutch teeth carried by the driven gear and the release clutch body, and a clutch hub slidable on the main shaft and rotatable therewith having clutch teeth for engaging either the clutch teeth carried by the driven gear or the clutch teeth carried by the release clutch body, resilient means normally urging the clutch hub in one direction and its teeth toward the teeth carried by the driven gear, manual means for sliding the clutch hub against the tension of said resilient means, and the teeth of the hub into engagement with the teeth of the release clutch body, means for automatically releasing the teeth of the clutch hub from the teeth of the release clutch body when a pre-determined pressure is reached, a stationary cam track secured to the frame, and a cam pin carried by the clutch hub for engaging said cam track when the teeth of the clutch hub are in engagement with the teeth of the driven gear.

ALLAN A. NORIN. 

